Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62a37c447a9d44f…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 23:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8d56f3fababda53bea85837f240dab0 SHA-1: e853a8a7a1713a4afe6d9f5baf13eb07606b7e66 SHA-256: c62a37c447a9d44f85572548821049f2b94d13f887ac83e91b0c390f0c152ed3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and an embedded URI pointing to a suspicious domain, suggesting an attempt to trick the user into downloading a payload or visiting a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates a potential for further exploitation or download of a second-stage artifact. No scripts were extracted from this sample, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/freespinandcoin-game-hack
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/roblox-promo-codes-2021-robux_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/100-free-spins-coin-master_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-roblox-app_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-100-free-spins-link_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft_GM479516143.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-codes_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-no-verify_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/earn-robux-now_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-android_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/cheats-for-coin-master_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/real-coin-master-hacks_GM406889139.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/easy-how-to-get-free-robux_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/roblox-controversy_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-roblox-gear_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/roblox-cheat-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048a5.bin
0a534e30d23252856643ececc92dae854a1d1b360f4172e84074646c5e24a78f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A5 24440 bytes
font_01_sfnt_off00007fff.bin
1c693cd3c749c7deb88a93ce437f6f23953c7e7e8560ccdde2498ee9463f8dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 17956 bytes

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